BRAINTREE, Mass. (AP) – A second victim was found Wednesday night in the wreckage of a building that was destroyed when a piece of the giant metal frame that once held shipbuilding cranes collapsed at the Fore River Shipyard.

Specially trained search and rescue dogs from the Federal Emergency Management Agency located the remains around 6:30 p.m., said David Traub, a spokesman for the Norfolk District Attorney’s office.

One man who was inside a vehicle when the building collapsed on top of it was confirmed dead earlier Wednesday by authorities. Neither man’s identity was immediately released, and they had not yet been pulled from the wreckage.

Emergency workers ended their search Wednesday night without reaching the first man of finding the second. But the FRMA search dogs arrived at the former shipyard after the search had been called for the night and were able to find the second man.

Authorities had not been able to account for the second man and were not certain that he was inside the twisted wreckage, but could not safely search the building for him.

The dogs were “able to go into parts of the building that people didn’t dare,” Traub said.

Braintree Fire Chief Gerald Kenney Jr. said it was not known why the structure collapsed, and likened the huge jumble of debris to the collapsed World Trade Center on Sept. 11.

Four other workers were injured, two of them seriously. The collapse was under investigation, and was being treated as a crime scene, Traub said.

“We have a death and we’d like to know the circumstances of how that death occurred,” he said.

Part of the Fore River Shipyard’s crane way, a huge metal superstructure that once held up to 22 separate cranes over the dry dock where ships were once built, collapsed on the building around 10:30 a.m. while workers were inside removing asbestos. Another crane in a portion of the shipyard in adjoining Quincy was demolished with explosives last year.

The portion of the crane way fell atop the building, which was next to the shipyard’s unused dry docks. About a third of the building came down in the initial collapse, and just before 2 p.m., workers knocked down another smaller section, so that workers could continue without fear of future collapse.

The Lynnfield demolition company Testa Corp. had been dismantling the crane way, although no demolition was going on when the crane way collapsed, said Nancy Sterling, a spokeswoman for the company. She said the company would cooperate with investigators.

“Our first concern is for the workers, and that’s the focus of our attention at the moment,” she said.

Shipyard owner Dan Quirk told The Patriot Ledger newspaper that Testa had been dismantling the crane way for the past four months.

“This is terrible, this is a tragedy,” Quirk said.

The crane way was once used by the shipyard, which built Navy ships during World War II and for many years afterward. It closed in 1987 but has since been purchased by Quirk, a local car dealer who has plans to store thousands of cars there and renovate the facility to handle commercial cargo ships. The shipyard is about 10 miles south of Boston.

Former Quincy City Councilor Michael Cheney, a labor consultant who was inside the building when it collapsed, told The Patriot Ledger that 12 workers were removing asbestos when the crane way fell on the building. One of the injured men was buried under four feet of bricks, Cheney said. He said the worker was conscious the whole time.

“He was screaming at the top of his lungs,” he said. “That’s how we found him.”

Two victims taken to Quincy Medical Center were in serious condition, said hospital spokeswoman Bonnie Goldsmith. She said one had been transferred to Boston Medical Center.

A 32-year-old worker was taken to South Shore Hospital in Weymouth. He was listed in good condition. Three other workers were injured but escaped from the building, the Ledger reported.

John Chavez, a spokesman for the Occupational Safety and Health Administration, said the agency would investigate the accident.

“It’s a horrible thing what happened, but the purpose of OSHA’s investigation is to find out what happened, with the ultimate goal of making sure that nothing like this happens again,” he said.